Blood

• Blood = Formed elements + plasma

– Formed elements (AKA “blood solids”)

• RBC’S (erythrocytes)

• WBC’s (leukocytes)

• platelets (thrombocytes)

• Red Blood Cells

– “bags” of hemoglobin

• White Blood Cells

– Granulocytes

• Neutrophils

• Eosinophils

• Basophils

– Agranulocytes

• Lymphocytes

• Monocytes

• Platelets (Thrombocytes)

– Derived from megakaryocytes

• Hemopoiesis

– All formed elements develop from hemopoietic stem cells

– Erythropoiesis: regulated by erythropoiten (EPO)

– Leukopoiesis: regulated by numerous factors

• Plasma

– Water

– Electrolytes

– Organic nutrients

– Organic wastes

– Plasma proteins

• Albumin

• Globulins

• Clotting factors (e.g. fibrinogen)

• Regulatory hormones